This work presents the development of a new photothermal radiometry (PTR) setup using a mix between frequency and spatial domain scans, along with a three-dimensional (3D) heat diffusion model. This newly developed PTR system, with a spatial resolution of 33 μm, is used to measure thermophysical properties of several kinds of materials. These properties include the thermal diffusivity, a, of homogeneous semi-infinite materials, thermal boundary resistance, , and thermal anisotropy of membranes. The measured properties for homogeneous semi-infinite materials and two-layered systems are in good agreement with the literature values. In addition, it was possible to obtain an anisotropic factor of 24.6 between the in-plane and cross-plane thermal diffusivity of a 25 μm anisotropic flexible graphite sheet. Furthermore, it was also possible to measure, both directly and independently, the anisotropic thermal diffusivities for a 1 μm titanium membrane. It is suggested that this new hybrid technique can help us to fill the gap between conventional PTR and other photothermal and thermoreflectance techniques. Using this PTR setup, it is possible to experimentally measure isotropic and anisotropic thermophysical properties of bulk and thin materials, including membranes, with high precision through accurate characterization of the pump beam spots size. This is accomplished without the need for an optical transducer layer.
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7 November 2020
Research Article|
November 03 2020
Spatially localized measurement of isotropic and anisotropic thermophysical properties by photothermal radiometry
Special Collection:
Photothermics
Georges Hamaoui
;
Georges Hamaoui
1
ITheMM, Université de Reims Champagne-Ardenne URCA
, Reims 51687, France
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Ezekiel Villarreal
;
Ezekiel Villarreal
1
ITheMM, Université de Reims Champagne-Ardenne URCA
, Reims 51687, France
2
Department of Mechanical Engineering and Materials Science, University of Pittsburgh
, Pittsburgh, Pennsylvania 15261, USA
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Heng Ban
;
Heng Ban
2
Department of Mechanical Engineering and Materials Science, University of Pittsburgh
, Pittsburgh, Pennsylvania 15261, USA
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Mihai Chirtoc
;
Mihai Chirtoc
1
ITheMM, Université de Reims Champagne-Ardenne URCA
, Reims 51687, France
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Nicolas Horny
Nicolas Horny
a)
1
ITheMM, Université de Reims Champagne-Ardenne URCA
, Reims 51687, France
a)Author to whom correspondence should be addressed: nicolas.horny@univ-reims.fr
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a)Author to whom correspondence should be addressed: nicolas.horny@univ-reims.fr
Note: This paper is part of the Special Topic on Photothermics.
J. Appl. Phys. 128, 175104 (2020)
Article history
Received:
June 30 2020
Accepted:
October 16 2020
Citation
Georges Hamaoui, Ezekiel Villarreal, Heng Ban, Mihai Chirtoc, Nicolas Horny; Spatially localized measurement of isotropic and anisotropic thermophysical properties by photothermal radiometry. J. Appl. Phys. 7 November 2020; 128 (17): 175104. https://doi.org/10.1063/5.0020411
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